<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>丑数</title>
</head>

<body>
  <script>
    function array(a) {
      let sum = [2, 3, 5]
      for (let num of sum) {
        while (a % num === 0) {
          a /= num
        }
      }
      return a == 1
    }
    console.log(array(7));

  </script>
</body>

</html>